Electrician&#39;s tool



FIG. 1..

March 3,

FIG.6.

A. Y. KISSINGER ET AL ELECTRICIAN S TOOL Filed Nov. 26, 1957 I INVENTORSARTHUR Y KISSIN GER WILLIAM S. SNYDER ATTORNEY United States Patent2,875,651 ELECTRICIANS TOOL Arthur Y. Kissinger and William S. Snyder,Lancaster, Pa. Application November 26, 1957, Serial No. 699,111 1Claim. (Cl. 77-73) This invention relates to a tool particularly adaptedfor use by electricians during the installation of wiring, conduits andthe like.

The cutting of metal conduits in lengths to form the particularinstallation either by a saw or a shear leaves burrs about the cut edgeswhich must be removed to avoid damaging the insulation on wires whenthey are pulled through the conduit, and also to remove the hazard ofinjury caused by said burrs to the installers hands.

Accordingly, an object of the invention is to provide a reamer devicehaving a lead end or guide end which will readily and easily remove theburrs from the cut edges of conduits of the range of diameter usuallyused and enable the installer to easily and quickly perform his work ina manner which is safe to himself and safe from the standpoint ofeliminating the possibility of injury to the wiring.

Another object of the invention is to provide a device in the nature ofa reamer which may be made in a form to be held to a handle by a shaftor stem, and which includes a one-piece cone having an external reamingsurface, or alternatively, the cone may be split longitudinally andprovided with threads for receiving an anchoring stud in the handle andalso a lead or guide rod which may, if desired, be formed at itsextremity opposite the handle as a screwdriver.

A further object of the invention is to provide a reamer which may bemade in sections so that it may be readily adapted and applied to theshank of tools such as screwdrivers already in use.

With the above and other objects in view, the invention consists in theconstruction and combination of parts hereinafter more fully described,illustrated and claimed.

In the accompanying drawings:

Figure 1 is a partial longitudinal sectional view illustrating thereamer applied to the shank of a lead or guide rod carried by thehandle.

Figure 2 is a perspective view of the one-piece reamer shown in Figure1.

Figure 3 is an exploded perspective view illustrating a modified form ofcone and showing how it may be assembled in relation to the lead orguide rod and the handle.

Figure 4 is a partial sectional view of the parts of Figure 3 assembled.

Figure 5 is an exploded perspective view of a twopart cone type reamerwhich may be applied to any exist ing tool having a shank or stem.

Figure 6 is a more or less diagrammatic view illustrating the range ofapplication of the invention of conduits of different diameters.

Similar reference numerals designate corresponding parts throughout theseveral figures of the drawings.

The reamer is designated generally as A, and as shown in Figures 1 and 2is of substantially conical formation,

having an external cutting face 1 and a central opening or bore 2 whichis preferably tapered to receive the shank 2 3 of a guide rod or stemwhich may be anchored as at 4 in the handle H.

In the embodiment shown in Figures 1 and 2, it will be understood thatthe reamer A is assembled with the handle in the form of a tool bydriving the shank 3 of the guide rod or stem into the tapered bore 2 andinto the handle so that the portion of the guide rod or stem projectingforwardly of the tip of the cone will enable the user to readily threador insert the tool in the conduit, designated generally as C. In manycases conduits are installed under poor lighting conditions and inplaces difiicult to reach. Therefore, for the reamer A to beconventionally and effectively used it is desirable that the rod or stemproject beyond the lead end of the reamer so as to easily guide the toolin operative position. As previously indicated, the forward end. of thestem may be formed as at S for use as a screwdriver.

Referring to Figure 3, it will be seen that the reamer is provided withsockets separated as at 2. These sockets are internally threaded asindicated at 6 and 7, re spectively, to receive a mating threadedportion 8 of the stem 3 and the related threaded portion 9 of the stud10 embedded in the handle. The body of the reamer is provided withtransverse openings at the location of the socket to receive thefastenings 11 which pass through openings 8* and 9 respectively to lockthe reamer tothe lead rod or stem 3 and the stud 9.

Referring to Figure 5, it will be seen that the reamer may be made inlongitudinally split sections A and A eachhaving complementarynon-threaded axial channel 12, which would enable the two halves to beclamped or otherwise secured together on any existing tool having ashank or stem, thereby materially increasing the range of the inventionand making it applicable to tools now in use, as well as thosemanufactured initially in final form.

While the reamer is shown as having a conical cutting surface, it willbe understood that an equivalent surface, such for example as a convexsurface will perform as required. The essential feature is that thereamer be smaller at its lead end than at its trailing end.

Also the lead or guide stem may be of any desired length. For example,it may be short for use in places where the cut in the pipe is near anelbow or it may be longer for straight unbent pipe.

Figure 6 illustrates a series of conduits of different diameter to showhow the reamer A may be used with conduits ranging from to 1%". Thus,the tool adequately performs in the normal range of application ofconduit installation.

We claim:

As an article of manufacture, an electricians tool for use in installingconduit pipe of different diameters to remove burrs from cut entranceedges of the pipe, comprising, in combination, a handle having acircular tapered stem-receiving socket, a circular tapered stemtherefor, and a conical reamer provided with a tapered axial circularbore having the wide end of the taper at the apex of the cone, saidcircular bore snugly receiving said stem and securing the cone to thehandle and the diameter of the apex and base of the reamer covering theminimum, intermediate and maximum pipe diameters with which the tool isused.

References Cited in the file of this patent UNITED STATES PATENTS 63,822Young Apr. 16, 1867 358,731 Clark Mar. 1, 1887 1,083,747 Kocher Ian. 6,1914 2,094,432 Pazzano Sept. 28, 1937 2,792,728 Novosel May 21, 1957

